Low carbing for a year and losing over 90 lbs. didn't affect my blood pressure. I am now on a calcium channel blocker for another condition and my blood pressure is usually (not always) in the normal range with this medication.

I'm not sure how much you want to lose, but my weight loss didn't really affect my BP until I'd lost about 100 lbs. I never had really 'high' BP, but it was borderline 'worrisome,' and I hoped it would go down with weight loss. It did, but not all that much. I mean it's in the ideal range now (120/70), but it was only about 140/85 when I was my heaviest.

If your BP is rising for other reasons than weight, the loss won't really help.

At the time my BP was 'worrisome,' my primary doctor gave me a Rx for a diuretic because he said that for women with moderately high BP, studies showed that a diuretic was effective. Apparently hormonal shifts cause water retention in women that can elevate BP. That was great because BP meds are very powerful, and it was nice to try the diuretic. It worked, so if you want to do something now, you might ask your doctor about this.

I took over a year to bring my blood pressure down to normal. I was at ideal weight for about 6 months before it began to drop. Once it dropped it did not rise again and it has been 4 years since I stopped medication.